Question

Решите уравнение пожалуйста

Answer 1

$a) \frac{2.8}{16.8} = \frac{28}{168} = \frac{1}{6}$
б)
$2 \frac{1}{4} \div 1 \frac{3}{8} = \frac{9}{4} \div \frac{11}{8} = \\ \frac{9}{4} \times \frac{8}{11} = \frac{18}{11} = 1 \frac{7}{11}$
в)
$1 \frac{21}{100} \div 3 \frac{3}{2} = \frac{121}{100} \div \frac{9}{2} = \\ \frac{121}{100} \times \frac{2}{9} = \frac{121}{450}$
$2)c - \frac{4}{7} c = 4.2 \\ \frac{3}{7} c = 4 \frac{1}{5} \\ c = \frac{21}{5} \div \frac{3}{7}$
$c = \frac{21}{5} \times \frac{7}{3} = \frac{147}{15} = 9.8$
Ответ:9,8